Propelling ejector



May 6 1924. 1,493,157

H. F. MELOT l PROPELLIG EJEcToR Filed Dec. 1o'. 192:5

Patented Mey 6, 1924.

PROPELLING 'EJECTO Application led December 10, 1923. Serial No. 679,785.

T all whom z't may concern:

Be it lxnownV that l., HENRI FABRICE Miino'r, a citizen of the Republic of France, residing at Paris, France, 43 Avenue du Maine, have invented certain new anduseful improvements in Propelling `Ejeetors, of which the following is a specification.

This invention relates to a propelling device of the hind described in Letters-Patent l@ of the United States No. 1,375,601 in which a motive tluid sent. through a plurality of ejector tubes in series draws atmospheric air and causes between the front and rear ends of the ejector tubesv a difference of pressure producing a thrust on the tubes, so that when the latter are mounted on a terrestrial vehicle, a marine vessel or an aircraft. the thrust causes propulsion thereof. ln accordance with the present invention, in

order to improve the efiiciency of such devices, the first4 ejector tubes of the series areof greater length than the following ejector tubes so as to provide a suliicient distance way for the high speed mixture of motive liuidand a-,ir aspired to have proper timel to expand yand carry along the maximum Aamount of air.

The accompanying drawing shows diagrainmatically an axial section of an embodiment of the invention. l

The injection nozzle a receives ,motive Huid from any generatingvdevice such for as example that described in my application Serial No. 679,784, filed even date.' Said device is designated on the drawing by the letter A and is not claimed herein. Nozzle @opens into the first ejector tube b which is -open to the atmosphere at c. Each following ejector tube 19,112 -is of lesser length 49 than the preceding tube or of equal length.-

The air drawnig'in at c mixes with the 'motive' Huid injected through the nozzle a. and the mixture whosekinitial speed -is vry high is abley to apply itself against the in-f7 ner walls Vof the ejector tubel b and has time to expand ,properly owing to the great length of said tube. When the Huid reaches the second ejector tube I), its speed is slower and it is not necessary to have it 5 follow such a great axial distance as in the first tube -for it to have the requisite expansion and produce the maximum reaction on the surroundingatmospheric air. rlhe same edeet occurs with the following ejector tubes.

lt may happen that the passage areas in the last ejector tubes becomes too great with respect to their length. in such case, according to the invention, a needle d having asuitableprofile is placed inside the ejector tubes and the nozzle it required, so as give them the proper passage areas. Said needle may be made movable in vthe axiai direction so as to permit of regulating the areas. i

The invention may also be applied to ejector tubes in series supplying gas tur-v bines or securing the blast of metallurgical apparatus.

What l claimvis:

l.v A propelling device with ejector-tubes in overlapping series wherein the first tubes have a greater length than t-he following tubes and each tube has its outlet arranged at therestricted portion of the following tube, whereby sufficient distance of passage is provided for the expansion of the mixture of motive tiuid and air aspired.

2. A propelling device with ejector tubes in series wherein the first tubes are of greater length than the following tubes, and having a needle in the opening of said tubes for providing the proper free passage areas.

3. A propelling device with ejector tubes in series 'the irst tubes having a greater length than the following. each tube having a convergent part and a divergent part, the corresponding parts of all thetubes being parallel. i 4.v A propelling device with ejector tubes in series the first tubes having a greater length than the following, each tube having al convergent part and a divergent part, the corresponding parts of all the. tubes being parallel, and each tube having a stream- '.clined surface.

ln testimony whereofl have signed my name to this specification. j

HENRI FABRICE MLOT.

Venturi 

